Patents by Inventor Warren E. Dean

Warren E. Dean has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Separation of dichlorobenzene isomers
    Patent number: 4089909
    Abstract: Metadichlorobenzene is removed from mixed dichlorobenzene isomers by a liquid phase Friedel-Crafts catalyst assisted chlorination in the absence of benzene or monochlorobenzene.
    Type: Grant
    Filed: September 22, 1976
    Date of Patent: May 16, 1978
    Assignee: PPG Industries, Inc.
    Inventors: Joseph E. Milam, Warren E. Dean, Robert K. Gerdes